Quarterly report pursuant to Section 13 or 15(d)

CRUDE OIL AND NATURAL GAS PROPERTIES - Summarized Unaudited Pro Forma Financial Information (Details)

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CRUDE OIL AND NATURAL GAS PROPERTIES - Summarized Unaudited Pro Forma Financial Information (Details) - VEN Bakken LLC - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2019
Asset Acquisition [Line Items]    
Revenues $ 221,347 $ 207,832
Net Income (Loss) $ 54,468 $ (85,275)